Dental chair



Nov. 26, 1929. A, J, MAY 1,737,505

DENTAL CHAIR Filed April 16, 1927 6 Sheets-SheetA l Illlllll? A. J. MAY

DENTAL CHAIR Nov. 26, 1929. u

Filed April 16. 1927 6 Sheets-Sheet 2 INVENTOR A. J. 'MAY DENTAL CHAIR Filed April 16. 1927 6 Sheets-Sheet 5 INVENTOR MIM@ SAT1

Nov. 26, 1929.

A. J. MAY

DENTAL CHAIR Filed April 1e, 1927 6 Sheets-Sheet 4 Nov. 26, 1929. y A, J, MAY 1,737,505

-DENTAL CHAIR Filed April 16. 1927 6 Sheets-Sheet 5 j@ l, Q96 fl j Z9 INVENTOR A. J. MAY

DENTAL CHAIR Nov` 26, 1929.

Filed April 16, 1927 6 sheets-sheet 6 w v lv m1 m W wn mm mfmwkm Patented Nov. 26, 1929 UNITED STATE-S PATENT 40,1:111313 ADAM JOSEPH MAY, OF ROCHESTER, NEW YORK, ASSIGNOR TO RITTER DENTAL MFG. C0. INC., vOE .ROCI-IESTER, NEW YORK, A CORPORATION OF DELAWARE DENTAL CHAIR Application led April 16,

The present invention relates to chairs and more particularly to foot rests therefor of the adjustable variety which may be used with dental, barbers and other types of chairs7 one object being to provide an improved foot rest of this class embodying relatively adjustable parts or sections with means by which the occupant of the chair yor an attendant can quickly and conveniently eect the Adesired adjustments.

A further object of the invention is to provide an improved foot Irest for chairs embodying a frame or footsboard section and a toe-board section or rest adjustable to different angular positions upon the frame and inwardly and outwardly with respect to the chair base whereby to accommodate persons who may occupy the chair from time to time.

A further object of the invention is to provide a foot rest including relatively adjustable parts or sections of simple construction which can be manufactured at a comparatively low cost and which include a single control member by which the occupant of the chair or an attendant can operate 0r control the same to both effect inward and outward movement of the adjustable part and to raise or lower it or vary its inclination with respect to the horizontal.

A further object of the invention is to provide in combination with a dental or other type of chair, a frame or foot-board having a -foot rest normally inclined with respect to the same and adjustable longitudinally thereon and also to and from substantial alignment therewith and having means for moving it to its dierent positions of adjustment and also means for automaticallyr locking it in said positions.

To these and other ends the invention re sides in certain improvements and combinations of parts, all'as will be hereinafter more fully described, the novel features being pointed out in the claims at the end of the specification.

In the drawings:

Figure l is a side elevation of a chair embodying one form of the invention;

Figure 2 is'a bottom plan of the foot rest 1927. Serial No. 184,239.

including the 'toe-'board and footboard shown removed from the chair;

Figure 3 isa bottom plan view of a `portion .of the foot rest, .partially in section and showlng' the operating means for the Carriage which supports the toe-board, .the operating means being in .position to elfect release Sof the `.brake or carriage locking means;

Figure 4 is a side elevation 'of the foot .rest with the toe-board shown inione of its nor- Inally inclined positions;

Figure 5 is a fragmentary `sectional elevation drawn to an enlarged scale and ytaken on line a-a 'of Figure 2;

Figure 6 is a transverse section taken yon line 6& 61 of Figure 12;

Figure 7 is la transverse section taken on line Ta-7 of Figure 2;

Figure S `isa :longitudinal section takenon b oard latclaing means shown in release position;

Figure -9 is :a fside elevationnffthe foot rest showing the toe-board adjusted 4into alignment with the foot-board;

Figure '10 is a side elevation lpartly in section showing the toe-board in its outermost angular position on the foot-board;

Figure 11 is a fragmentary sectional elevation taken on line 11n- 11a Aof Figure 3 showing the locking :bolt for holding the .toeboard and carriage against longitudinal movement when the parts are adjusted to the position shown in Figure-9 l Figure 12 is a perspective view of a pivotal support for the operating lever .shown in plan in Figures 2 and 8,;

Figure 13 is an enlarged detailed section taken on line 13a-,13a of Figure -3 showing-the carriage lockingk means in service position;

Figure 14 is a similar viewwith'the locking means shown in release position; and

Figure l5 is a detailed vperspective view showing one end of the lock release bar, the application Aof which is besty shownin Alzligures 3 and 6.

Similar reference numerals throughout lthe several 'views indicate the same parts.

The present invention embodies, generally7 a chair 'ha-vinga foo-t restcomprising a main frame portion or section in the form of a foot-board carried by the chair and an adjustable section thereon in the form of a foot rest or toe-board with means by which either the person occupying the chair or the dentist or other attendant may conveniently adjust the toe-board inwardly or outwardly to a position which will best suit or accommodate `the patient or occupant of the chair.

`The invention further contemplates adjustment of the toe-board into and out of substantial alignment or parallel relation with the foot-board either by the patient or the attendant and throughthe use of the same operating or control means employed for reciprocating it upon the frame or foot-board. The toe-board may be adjusted into alignment with the foot-board at any time desired, but particularly at such times as it becomes necessary to have `the pat-ent occupy a reclining position as when administering an anzesthetic, during which time complete relaxation on the part of the patient is desirable. Under these circumstances, if the toe-board remained inclined with respect to thev footboard, the patient might use the former to x brace and stiften himself which would be objectionable since it would result in tensioning of the muscles, whereas, relaxation at such a time is highly important. i

Referring to the drawings, 10 represents a chair frame or base having a seat base or frame 11 thereon carrying a seat or cushion 12 and certain other parts including the side arms 13 and the adjustable back support 14, which may be of any preferred construction. T he chair is preferably of the extensible type and may be raised and lowered by any suitable means, such as an electric motor, not shown, but adapted to be controlled by the switch pedals 15 shown in Figure 1. The scat frame or base 11 carries a downwardly and :forwardly extending frame or bracket 16 having extended side or arm portions 17 upon which is superimposed the foot rest including the foot-board or frame 18 and the toe-board 19. The foot-board is preferably in the form of a cast plate 21 and carries a suitable cover 21a, preferably comprising a rubber mat secured by angle plates 22 as shown in Figures 6 and 7. The foot-board is detachably secured to the arm portions 17 by screws 23 as indicated in Figure 6. The toe-board is preferably in the form of a casting 24 and carries a cover 24a of rubber'or other suitable material secured by angle plates 25. The angle plates 22 and 25 are preferably secured to the foot and toe-boards by screws as shown in Figure 1. The toe-board is mounted upon the frame or foot-board through the medium of an adjustable carriage 26 and a U-shap'ed support or bracket 27 including a transverse portion 28 and inwardly projecting plate portions 28L extending beneath the toe-board and suitably connected therewith as by means of the screws 29, Figure 2. The carriage 26 is reciprocally mounted upon guides 30, preferably in the form of rods having their opposite ends supported by front and rear lugs 31 and 32 on the bottom of the footboard frame, connected respectively by ribs 33 and 34. The carriage 26 is provided with front and rear bearings 35 and 36, respectively, through which the rods extend. Cushioning members 37 are provided for the carriage, the same being mounted on the rods 30 against the lugs 32, Figure 3, which are preferably integral with the foot-board casting 18. Screws 38 extend into` the lugs 32 and engage and hold the rods against displacement. The transverse portion 28 of the U-shaped bracket 27 is provided with upwardly extending arms 39 pivoted on a transversely extending shaft or support 40 extending through lugs 36 and 36b projecting downwardly from the bearing lugs 36 of the carriage 26, Figure 3.

A sleeve 41 is fitted in the lug 36a to form an elongated bearing for the shaft at one side of the carriage. The transverse portion 28 of the bracket 27 is provided with a pair of spaced lugs 42 and 43 carrying a pin 44 on which is pivotally mounted a locking or holding element 45, preferably in the form of a detent, notched at its rear or free end to receive a keeper preferably comprising a sleeve 46 extending transversely of the detent and supported by a plurality of lugs 47, 48 and 49, projecting downwardly from the carriage 26, Figure 6. The detent is normally held in engagement with the keeper 46 by a spring 50 coiled about the pivot pin 44 of the detent and having one end held by the lug 43 and the other extending under the detent to constantly exert an upward pressure thereon. The detent therefore serves as a holding means for the toe-board to maintain it in its different angular positions upon the carriage and with respect to the foot-board as hereinafter described.

The means for effecting release of the detent or holding means and for moving the carriage upon its guides longitudinally of the foot-board comprises a pedal or foot lever 51 which projects slightly to one side of the foot-board frame as shown in Figures 2 and 6 and which is pivoted at its inner end at 51a to an arm or lever 52. The arm 52 is provided with a hub or bearing 52a pivoted upon a bolt 53, Figure 5, having spaced portions 54 intermediate its ends, on ther lower of which the outer end of the lever arm 52 is seated. The upper end of the bolt projects into a lug 55 on the carriage 26 and is held by the head of a screw 56 threaded into the bolt. The lever arm 52 is held upon the bolt by the head of a screw 57 threaded therein. The lever 51 is therefore pivoted to swing upon the arm about a horizontal axis at right angles to the axis of the bolt 53 on which said arm is adapted to swing. The lever 51 is providedintermediate its ends with an opening 58, Figure 5, in the bottom of which is iitted a socket member 59 having a recess 'adapted to receive a head 6() of a link 61 extending upwardly through said opening. The upper end of the link is provided with a head 62 lit-ting in a recess of an arm 63 held rigid on the shaft by a key 64. The link heads GO and 62 and the recesses in which they operate are, preferably, of the ball and socket type whereby universal movement of the vlever 51 is permitted so that it can be moved either in a horizontal plane through the pivotal movement of the arm 52 or downk wardly as indicated by the dotted line position shown in Figure 6 to rock the. shaft i0 in its bearings for a purpose hereinafter described. The lever 51 is limited in its upward moven'i'ent through engagement of a laterally extending portion 65 thereof with the underside of one of the ears or lugs 66 projecting 'from the hub *52L on the outer end of the arm 52, Figures 5 and 12. The lever is normally held in the horizontal position shown in Figures 5 and v6 by a torsion spring1 '67 coiled about the shaft Ll0, Figures 3 and 8, one end of the spr-ing bearing against the carriage 26 and the otherbeing anchored upon a set screw 68 threaded into a boss 69 on a pawl or finger 70. The set screw serves to .hold the Ilinger in proper position on the shaft.

The inner end of the arm 52 is adapted to ride upon the lower end of the lug 49 projecting downwardly from the carriage, whereby to avoid undue strain on the pivot bolt during depression of the outer end of the operating lever 51, it being understood that downward movement of the lever tends to thrust the inner end of the arm 52 upwardly. The pawl 70 is provided for depressing and releasing the detent or holder l5 when it is desired to adjust the toc-board into alignmentwith the foot-board as indicated in Figure 9. For this purpose, thexdetent carries an actuatorl 71 on a pin 72 projecting from the detent. A torsion spring 73 is coiled about the pivot pin and has one end extended beneath an abutment 74; on the detent and the other over a projection 75 on the `actuator whereby the latter is normally held in the position shown in Figure 5. rPhe actuator is Aprovided with a bifurcated or recessed portion 76 adapted to receive the rounded end 77 of the pawl 70 upon full depression of the pedal or lever 51 which can only be effected when the toe-board is moved outwardly to the position shown in Figures 5 and 10. This is due to the fact that in any other yposition of the toe-board the extended portion 781of the arm 63 is rmoved up into engagement with a rib 79 on the bottom of the footboard frame before the arm 63 and pawl 70 are depressed far enough to release the detent. Consequently, the carriage can be moved inwardly or outwardly to dilferent povboard. the toe-board with the foot-board for the sitions by using the foot to push or pull on reasons stated above, the carriage is moved to the extreme forward position shown in Figure 5 and against the cushioning members 37 in which position the extension 78 of the arm 63 lies beneath a recess 8O in the front end of the foot-board casting. In this yposition of the parts, if `the kpedal lever is depressed, link 61 will pull down on the arm 63 to rock the shaft 40 whereby the rounded end 77 of the pawl 70 will move into the recess 76 of the actuator 71 and if the pawl continues to move downwardly the actuator will rock on its pivot and depress the detent as shown in Figure 8. At the same time, the extension 78 of the arm 63 will move into the recess 80. The toe-board due to the action of gravity will then begin to drop, swinging about the axis of the shaft 10 during which time the detent pivot 14; will move upwardly and rearwardly whereby the detent is also moved rearwardly and since it is still held released, the portion 81 thereof will move under and ride on the holding part i6 until the upstanding shoulder or lug 82 of the detent moves into engagement with said part as shown in Figure 9. In this position, the

toe-board becomes aligned with the footboard, the detent moving into the position shown in 'Figure 9, while the toe-board is dropping, during which time the pawl will move out of the vnotch or recess of .the actuator and the latter will be returned to the normal position shown in Figure 5 by the spring 78.

Raising the toe-board is effected by depressing the pedal lever to rock the arm 63 which carries a shoulder or lug 88 adapted to cooperate with a cushioning member 84 on a lug 85 of the transverse portion of the .toeboard bracket to swing the toe-board from the position shown in Figure 9 to that shown in Figure 10, In this movement, Vthe pivoted end of the detent 45 is swung downwardly and forwardly, until the notch in its rear end is opposite the holding part 46, at which time spring 50 will automatically lift the free end of the detent to the position shown in Figure 10. In this position, the end of the pawl 70 is in engagement with the forward edge of the actuator, the latter assuming the position shown in .Figure 10 as Vthe detent snaps into 4locking position. Upon release of the pedal, the spring A67 will rock the shaft 4:0 and lift the pawl which rides upon the forward edge of the actuator to clear the latter as shown in Figure 5. At this time the Vactuator is returned by its spring to the llo position shown in this figure whereby it is again placed in position to cooperate with the pawl when subsequently moved to release the detent as when the carriage is returned to its outermost position where the Xtension 78 of the arm 63 may again move into the recess 80 to allow the toe-board to be lowered into alignment with the footboard.

Means is provided for automatically locking the carriage and the toe-board thereon in its outermost horizontal position as shown in Figure 9 so that the toe-board cannot be moved longitudinally of the frame or footi board until it has been raised from lowered position. This means is shown in Figure 11 and comprises, preferably, a locking bolt 86 adapted to take into a recess 87 of the footboard easting, the bolt being guided in a portion 88 of the carriage bed, Figure 7. The bolt is provided at its lower end with a later ally projecting pin 89 extending into the notched end of an operating member comprising a plate like arm 90 on the shaft 40,

' Figure 3, located between the carriage lug 36a and one of the arms 39 of the toe-board bracket. The operatingl plate is secured to said arm by screws 91, the heads of which are countersunk in the plate. It will be seen, therefore, that upon lowering the toe-board which effects rocking of the shaft 4() through cooperation of part 84 with lever 68, the operating element of the locking bolt will be raised to the position shown in Figure 11 where it will prevent movement of the carriage. However, upon raising the toe-board, the locking bolt will be automatically withdrawn from the recess 87.

Means for holding the carriage in any position of adjustment of the toe-board is provided in the form of an automatically operated brake or locking device normally occupying a locking position and adapted to be released when the pedal or operating lever is actuated to advance or retract the carriage. The brake proper is preferably in the form of a U-shaped clamping element 92 surrounding one of the rods 30 by which the carriage is Ysupported and guided. This element is mounted between the lug 36" of the carriage and another lug 93 thereon as shown in Figure 8. A plate 94 connects said lugs and forms a support for an adjusting screw 95 for varying the distance between the split ends of the clamping element 92 to take up for wear and to afford the desired pressure for holding the carriage in adjusted position. The inner portion of the clamping` element is preferably provided with a hardened pin or insert 96 upon which rests the eccentric or cam portion 97 of a lever 98 carried by a pivot pin 99 threaded into the bottom of the carriage base 2G. The lever 98 is arranged to be moved to release position simultaneously with the movement of the pedal lever when the latter is swung in either direction upon its pivot 53 to advance or retract the carriage. This is done through the medium of a rod 100 slidable in the detent holding sleeve 4G carried by the lugs 47 48 and 49, Figure 3. The rod has an enlarged head or shoulder 101 which is slotted to receive a forked shaped element 102 suitably secured to the rod as by means of screws or pins 103 extending through holes 104 in said element. The fork 102 is adapted to overlie the pedal arm 52 and to straddle the pivot bolt 53 between the upper and lower collar portions 54 and 54a thereon as indicated in Figure 5. The fork is provided with shoulders or abutments 105 in engagement with a pair of upwardly eX- tending studs or pins 106 carried by the hub portion 52a of the pedal arm 52. Thus when the pedal lever 51 is operated either forwardly or rearwardly to swing about the axis of he pivot bolt 53, one or the other of the pins 10G will move the 'fork 102 to actuate the rod 100 which, in turn, will actuate the lever 98 and relieve the clamping action on the spring jaws of the brake or locking eleinent- 92 whereby the carriage can be pushed forwardly or pulled rearwardly by the foot of the operator as desired. A spring 107 on the rod is interposed between the shoulder 101 thereof and the lug 49 on the carriage and serves to return the fork 102 and through it, the pedal lever to normal position when the latter is released.V A second spring 108 guided by the reduced end 109 of an adjusting screw 110 serves to return the lever 98 to clamping or locking position when the pedal is returned to normal position by the spring 107. The adjusting screw is threaded in a lug 111 projecting downwardly from the carriage base 26 adjacent one of the bearings 35 and is preferably recessed to receive the outer end of spring 108 as shown in Y Figure 3. A locking nut 112 holds the screw 110 in adjusted position, the latter serving to regulate the movement of the lever 98 and also forming a stop for limiting the swinging movement of the pedal lever elements 51 and 52.

In the operation of the adjustable section of the foot restn assuming it to be in the position shown in Figure 4, the occupant of the chair.` whether in an upright or in a reclining position by using his foot to push outwardly on the pedal lirst swings it about the pivotal axis of the bolt 53 during which time one of the pins 106 on the swinging arm 52 will actuate the fork 102 and rod 100 to move the lever 98 to the position shown in Figure 3 whereby to effect release of the carriage locking or clamping element 92 on one of the guide rods 30. The lever 98 in this position engages the screw 110 which forms a stop for limiting the swinging movement of the pedal 51, this operation being the same regardless of whether or not the foot of the operator is it is desired to lower the footl rest section 19 to the position shown in Figure 9. During outward and inward movement of the carriage to and Yfrom the position shown in Figure depression of the pedal to any considerable degree is prevented by engagement of the extended portion 78 et the lever arm 63 with the underside of the rib 7 9 on the footboard casting 21. However, as soon as the carriage reaches its outermost position the recess 80 in the foot-board will permit the extension 78 of lever arm 63 to move therein upon downward pressure of the pedal. Downward movement of the pedal at this time will cause the link 61 to rock the shaft 40 which will, in turn, depress the pawl 70 moving it into the notch 7 6 of the actuator 7l which, in turn, will depress and release the detent from locking position upon the holding part 46 and the toe-board section will then by the action oi' gravity be lowered to the position shown in Figure 9 in which it is held through engagement oi the shoulder 82 on the detent with the holdingpart 46. Then the toe-board section is moving to the position shown in Figure 9, the locking bolt 86 will be moved into the recess 87 as indicated in Figure 11 whereby retraction of the toe-board section is prevented. Subsequently, when the pressure on the pedal is released, the spring 67 will return the toe board section to the position shown in Figure 9. From this position, if it is desired to raise the foot rest section, the pedal is again depressed at which time the lug 83 of arm 63 through cooperation with the parts 84 and 85 on the transverse portion` 28 of the toe-board bracket will swing the latter about the pivotal axis of the shaft 40. This causes the detent 45 to move forwardly until the notch in the free end thereof is opposite the holding part 46 at which time the spring will raise the detent into locking or holding position as shown in Figure 4 in which position, the pawl 70 will again overlie the actuator 71. The carriage and the foot rest section 19 thereon may then be retracted to any desired position upon the footboard section where the carriage will become automaticallylocked upon release of the pedal as explained above. It will be understood that in advancing the carriage, the operator will preferably use the ball of the foot to press outwardly upon the pedal and that in retracting the carriage the toe of the shoe may be used to exert a pull on the pedal.

l claim as my invention:

1. ln apparatus of the class described, a

'l trame adapted for attachment to a chair base, a carriage reciprocably mounted uponV the frame, a foot rest mounted to swing upon the carriage to different positions of adjustment, holding means for retaining the 'foot rest in adjusted. position and operating means tor reciprocating the carriage movable to effect release of the holding means, when the toot-rest is moved to a predetermined position, said holding means being arranged to automatically return to holding` position when the foot-rest is swung to one of said posit-ions.

2. In apparatus of the class described, a trame adapted for attachment to a chair base, a carriage reciprocably mounted longitudinally upon the frame, a foot rest mounted to swing uponl the carriage to different positions of adjustment, holding means for retaining the foot rest in adjusted position, operating means for reciprocating the carriage movable to effectrelease ot the holding means and means arranged to automatically lock the carriage when in 'one position of adjustment.

8. In apparatus of the class described, a frame adapted for attachment to a chair base, a carriage reciprocably mounted upon the frame,a toot rest pivotally connected with the carriage :tor a raising and lowering movement thereon, releasable holding means for supporting the :toot rest in raised position, operating means for reciprocating the carriage upon the frame and actuating means arranged to be moved by the operating means to release the holding means when the carriage is in one position upon the Yframe to permit lowering of the foot rest, said operating means being` also adapted for raising the toot rest from said lowered position.

4. In apparatus of the class described, a frame adapted for attachment to a chair base, a carriage reciprocably mounted upon the frame, a support pivoted upon the carriage, a foot rest mounted to swing upon the support to dierent positions' with respect to the trame, releasable holding means interposed between the' carriage and the toot rest arranged to hold the latter in said diiterent positions, operating means for reciprocating the carriage upon the trame, means interposed between the operating means and the pivoted support movable to actuate the latter when the carriage is in a predetermined position and means arranged to be actuated by the support when the carriage is in said position to eitect release of the holding means.

5. In apparatus ot the class described, a frame adapted for attachment to a chair base, a carriage reciprocably mounted upon the frame, a support pivoted upon the carriage, a toot rest section mounted to swing upon the support t0 different positions with respect to the frame, a detent interposed between the carriage and the foot rest section for holding the latter' in one position, a pivoted actuator on the detent, a pawl on the support arranged to cooperate with the actuator to effect release of the detent in one position of the carriage, operating means for reciprocating the carriage on the frame to and from said position with the detent in holding position and means interposed between the operating means and said pivoted support arranged when the carriage is in said position to actuate the support to effect movement of the pawl and operation oi the actuator to release the detent.

6. In a dental chair, the combination with a seat supporting base and a frame connected therewith, of a foot rest section reciprocablyv mounted tor longitudinal movement upon said frame and also mounted to swing to different positions thereon, operating means including a control member movable in different directions for reciprocating and swinging the section to its different positions, and means cooperating with the operating,` means and associated with the frame to limit movement of the control member in one plane while moving to effect reciprocation of the foot rest section to and from a predetermined position.

7. In a dental chair, the combination with a seat supporting baseA and a frame connected therewith, of a foot rest section movable bodily and longitudinally upon the frame and arranged to be swung into and out of substantial alignment therewith when moved to a predetermined position and operating means for moving the section bodily to said position and for controlling its swinging movements7 said operating means being limited in its movement in one plane by the trame when the foot rest section is moving to and from said position.

8. In a dental chair, the combination with a seat supporting base and a frame connected therewith, of a carriage reciprocably mounted upon the frame, a foot rest section pivotally mounted on the carriage to swing relative to the frame, releasable holding means for connecting the carriage and toot rest sec tion to support the latter in a predetermined position with respect to the frame and operating means including a control member movable in diterent planes to reciprocate the carriage and to release the holding means.

9.V In a dental chair, the combination with.

a seat supporting base and a frame connected therewith, of a carriage reciprocably mounted upon the frame, a foot rest section pivotally mounted on the carriage to swing relative to the frame, releasable means for holding the foot rest section in diferent positions ot' adjustment upon the carriage and means for both reciprocating the carriage and swinging the foot rest section, said means being also adapted for releasing the holding means.

10. In a dental chair, the combination with ak seat supporting base and a frame connected therewith, of a carriage adjustable upon the frame, a foot rest section overlying the frame and arranged to be swung upon the carriageinto substantial alignment with the frame when the carriage is adjusted to al predetermined position thereon and means for adjusting the carriage to and from said position, said means being adapted to swing the foot rest section into and out of substantial alignment with the frame.

ll. In a dental chair, the combination with a seat supporting base and a frame connected therewith, of a carriage reciprocably mounted beneath the frame, a foot rest sec-V tion on the carriage arranged to extend in upright position above the frame and having supporting arms projecting from its sides, the arms being pivoted to swing upon the carriage to adjust the section into substantial alignment with the trame whenthe carriage is adjusted to a predetermined position, releasable holding means for maintaining the section in said upright position and means for adjusting the carriage to said predetermined position, said means being adapted to effect release or" the holding means to permit the foot rest section to swing into substantial alignment with the frame.

12. In a dental chair, the combination with a seat supporting base and a 'foot-board sec tion connected therewith, of a carriage re ciprocably mounted upon the foot-board section, a foot rest section pivoted upon the carriage to swing relative to the foot-board section when the carriage is in a predetermined position, holding means for the :toot-rest section releasably engaging the carriage, locking means for the carriage, a member having a limited swinging movement upon the carriage in opposite directions Jfrom a normal inoperative position, means actuated by said member when the latter is swung in either direction adapted to effect release ot said locking means, an operating element for reciprocating the carriage adapted to move said member to either of its lock releasing positions an d means adapted to be actuated by the operating element when the carriage is in said predetermined position to eifect release of said holding means in order to permit the Jroot rest section to swing upon the carriage.

13. In a dental chair, the combination with a seat supporting base and a foot-board section connected therewith, of a carriage reciprocably mounted on the foot-board section, a foot rest section pivoted on the carriage to swing relative to the toot-board section when the carriage is in a predetermined. position, releasable holding means interposed between the carriage and the foot rest section adapted to normally hold the latter inclined with respect to the foot-board section, locking means for the carriage and operating means comprising relatively movable members one of which is adapted to swing upon the other,

he latter being; arranged to swing to different positions upon the carriage to eliect release of said locking; means and the other being a-rranged to etlect release ot the holding means when the carriage is in said predetermined position., said last mentioned member being adapted when pressure is exerted thereon i-n opposite directions to cooperate with the other member to reciprocation of the carri-agie.

let- In a dental chair, the combination with a seat supporting` base and a toot-board section thereon, a carriage reciprocably mounted upon theV toot-board section, a rock shaft pivoted upon the carriage, a toe-board section n'iounted toswing upon the rock shaft when the carriage is in a predetermined position, locking` means for'the carriage, holding means interposed between the carriage and the toe-board section adapted to normally hold the lattei` inclined, with respect to the toot-board section, means on the rech shaft adapted to move the holding means to release position, an arm on the rock shaft, a pivotedy member arranged to swing on the carriage and adapted to etlect release ot the locking means, a control member arranged to swing on the pivoted member and adapted to cooperate with the latter to etiect reciprocation of the carriage and a connection between said control. member and said arm by which the latter is actuated to rock said shaft when the carriage is in said predetermined position whereby to eifect release ot the holding means and lowering of the toeboard section substantially into alignment with the foot-board section.

l5. The combination with a seat supporting base and a frame connected therewith, ot a foot-rest section mounted to slide and to to different positions upon the trame, an operating` device for effecting a bodily ding movement of said section and means comprising relatively movable parts arranged to be actuated by said device for swinging the. section to one of said. positions.

16. he combination with a seat supporting` base and a trame connected therewith, of a support movable bodily upon and longitudinally ot' said trame, a foot-rest section movable bodily with the support and to different angular positions thereon, an operatino; device upon the support for effecting* bodilly movement thereof, means arranged to be actuated by said device for moving` the section to one of said angular positions and means 'for automatically locking the section when moved to the last mentioned position.

17. The combination with a seat supportingr base and a frame connected therewith, of a support movable bodily upon and longitudinally of said frame, a foot-rest section mounted to swingv to different positions upon the support, a locking device actuated by the section te lock the support upon the trame when the section is moved to one oit said positions, said locling device being released by the section when the latter is moved to the other ot said positions, an operating device for moving the support and means arranged to be actuated by said operating device to swing said section to the last mentioned position.

18. The combination with a seat base and a frame connected therewith, of a support movable bodily upon and longitudinally oi the frame, a foot-rest section movable with the support and arranged to swing` to diii'erent positions thereon, an operating device movable with the support to effect movement thereof and also movable relative thereto, an actuating` device for swinging the section to one of said positions arranged to be actuated by said operating` device upon movement tlricreoi relative to the support with the latter in a predetermined position upon the trame, .saidv actuating device having a part cooperating' with the frame in other positions ot the support to hold the operating' device against relative movement upon the frame.

19. The combination with a chair, a trame connected therewith, a slide movable on the trame toward and from the chair, a footrest movable bodily with the slide and mounted to swingto diiierent positions thereon, and operating means comprising` relatively movable parts one of which is arranged to be actuated by the occupant oit the chair to control the remaining` parts whereby to both effect movement et the slide and a swinging movement of the toot-rest thereon.

20. The combination with a chair, a frame connected therewith, a slide movable on the trame toward and from the chair, Jfootrest movable bodily with the slide and mounted to swing` to different positions thereon, means for holding the foot-rest in one of said positions, and operating' means comprising; relatively movable parts for actuatingthe slide and for swinging the foot-rest and effecting release ot the holding means, one of said parts being positioned for control bv the occupant ot the chair to effect opera-tion of the remaining'parts.

2l. In apparatus of the blass described, a frame adapted for attachment to a chair base andphaving guide portions thereon, a carriage mounted upon l@guide portions for moven'ient longitudinally thereof, a foot-rest movable bodily with the carriage and arranged to swing` thereon to dilerent positions and operatingr means for both shitting the carriage and swingingv the toot-rest thereon comprising` relatively movable parts one of which is operable to reciprocate the carriage and to actuate another of said parts to effect ay swinging` movement of the toot-rest upon the carriage.

22. In apparatus of the class described, a frame adapted for attachment to a chair base and having a portion forming a foot-board, a carriage reciprocally mounted below said foot-board for movement longitudinally thereof, a foot-rest section `movable bodily with the carriage and arranged to swing thereon to different positions, releasable means for holding the foot-rest section in one of said positions, and relatively movable cooperating parts for shifting the carriage and for swinging the toot-rest section thereon.

23. In apparatus of the class described, a frame having one end adapted for attachment to a chair base, a foot-board on the frame, a slide below the foot-board arranged for movement toward and from said frame end, a foot-rest section mounted upon the slide for movement bodily therewith and arranged to swing upon the slide from a position substantially in alinement with the foot-board to a predetermined angular position with respect thereto, and operating means comprising relatively movable parts for shifting the slide and for swinging the foot-rest section thereon.

24. In apparatus of the class described, a trame having one end arranged for attachment to a chair base, a foot-board on said trame, a toot-rest mounted for a reciprocating movement longitudinally upon said frame toward and from said vtrame end and Jfor a swinging movement between a lowered position substantially in alinement with said tootboard and an angular position relative thereto, operating means for reciprocating said toot-rest mounted to travel therewith, means arranged for movement by said operating means to swing the toot-rest from said lowered to said angular position and locking means for holding the foot-rest in said angular position.

25. In apparatus of the class described, a frame adapted for attachment to a chair base including spaced guide portions, a carriage mounted Jfor reciprocatioii longitudinally upon said guide portions, a toot-rest section movable bodily with the carriage andarranged to swing thereon to different positions and operating means interposed between the carriage and section for both sliding the carriage and swinging the section thereon, said operating means comprising a plurality of relatively movable parts one of which is mounted for movement upon the carriage and arranged to actuate another of said. parts to eileet a swinging movement of the tootrest section upon the carriage.

Q6. In apparatus of the class described, a frame adapted for attachment to a chair base, a foot-rest section reciprocally mounted for movement longitudinally upon the frame and also mounted for a swinging movement thereon to diilerent predetermined positions,`

for effecting release of the locking means in advance of reciprocation of the section, and means responsive to the operating means when the section is in one position for swinging it upon the trame.

27. In apparatus of the class described, a frame adapted for attachment to a chair bas, a foot-rest section reciprocally mounted upon the frame and also mounted for a swinging movement thereon to and from different positions, a locking device for holding the section against reciprocation, a second locking device for holding said section in one ot' said positions, and operating means including relatively movable parts for swinging and reciprocating the section and for releasing said locking devices.

28. ln apparatus of the class described, a frame having one end adapted for attachment to a chair base, a support movable bodily upon tlie frame toward and from said end, a foot-rest section arranged to swing to diterent positions upon the support and to move therewith toward and from said frame end, cooperating parts on the support and section arranged to automatically lock the section when swung to one of said positions, and means inclu-ding relatively movable parts for actuating the support and for swinging the foot-rest section thereon.

29. In apparatus of the class described, a frame adapted for attachment to a chair base, a carriage reciprocally mounted for movement longitudinally upon the frame, a footrest section mounted on the carriage to swing from a lowered to a raised position thereon, means interposed between the carriage and section for holding the latter in said raised position, operating means for reciprocating the carriage, parts arranged to be actuated by said operating means for raising the section and means controlled by said parts for releasing the holding means.

30. In apparatus of the class described, a fra-me adapted for attachment to a chair base, a carriage reciprocally mounted for movement longitudinally upon the frame, a footrest mounted to swing to different positions upon the carriage and to move bodily therewith, holding means for retaining the footrest in one of said positions, operating means for swinging the foot-rest to the last mentioned position, and means arranged t-o be actuated by t-lie operatng means to effect release of the holding means.

3l. Inapparatus of the class described, a frame adapted for attachment to a chair base, a carriage reciprocally mounted for movement longitudinally upon the frame, a footrest mounted to swing to different positions upon the carriage, holding means interposed between the carriage and toot-rest tor holding the latter in one of said positions, operating means for reciprocating the carriage, means under the control of the operating means for releasing the holding means, and means arranged to automatically lock the carriage on the frame upon return ot the operating means to normal position.

32. In apparatus of the class described, a frame adapted for attachment to a chair base, a carriage reciprocally mounted upon the trame, a foot-rest mounted to swing to ditferent positions upon the carriage, a holding device for the 'toot-rest, an actuating device for swinging the foot-rest upon the carriage, means actuated by the toot-rest to lock the carriage when the foot-rest is moved to one of said positions, an operating member for reciprocating the carriage connected with the actuating device for swinging the foot-rest between said positions and means responsive to the actuating device for releasing the holding device upon movement of the operating member with the carriage in a predetermined position.

33. In apparatus of the class described, a frame adapted for attachment to a chair base, a carriage movable upon the frame, a footrest mounted to swing upon the carriage, a device for holding the foot-rest in a predetermined position, an operating member 1to1' reciprocating t-he carriage movable relative thereto, an actuating device :tor swinging the 'toot-rest to said predetermined position arranged to be actuated by said operating member, and means responsive to the actuating device for releasing the holding device when the operating member is moved to a predetermined position.

34. In apparatus of the class described, a frame adapted for attachment to a chair base, a carriage movable upon the frame, a footrest mounted to swing on the carriage, a device interposed between the carriage and tootrest for holding` the latter in a predetermined position, an operating member Jfor reciprocating the carriage movable relative thereto, cooperating relatively movable elements connected with the operating member and movable thereby to swing the foot-rest to said predetermined position, and means responsive to one of said elements arranged to effect release of said holding device when the carriage is in a predetermined position.

35. In apparatus of the class described, a frame adapted for attachment to a chair base, a carriage movable upon the Jframe, a footrest mounted to swing upon the carriage between a raised and a lowered position, a releasable holding device interposed between the carriage and foot-rest for holding the latter in either of said positions, an operating member for reciprocating the carriage movable relative thereto, means arranged to be actuated by the operating member to swing the foot-rest to said raised position, and a part arranged to be actuated by a portion of said means to release the holding device upon movement of the operating member to a predetermined position when the toot-rest is held in raised position by the holding device.

36. In apparatus of the class described, a frame adapted for attachment to a chair base, a carriage reciprocally mounted upon the frame, a foot-rest mounted to swing upon the carriage between predetermined positions, a keeper on the carriage, a holding member for the foot-rest connected therewith and having` spaced shoulders each arranged to cooperate with the keeper to hold the foot-rest in one of said positions, operating means for moving the carriage, mechanism controlled by said operating means lor swinging the foot-rest between said predetermined positions, and means arranged to be actuated by said mechanism to effect release of the holding member from one of said positions when the operating means is moved to a predetermined position.

37. In apparatus of the class described, a frame adapted for attachment to a chair base, a carriage reciprocally mounted upon the i'rame, a foot-rest mounted to swing upon the carriage between predetermined positions, a releasable holding device for the foot-rest interposed between the latter and the carriage, an arm pivoted to swing upon the carriage and arranged to swing the toot-rest to one of said predetermined positions, an operating member pivotally connected with the carriage and arranged for movement in a plane substantially paralleling its pivotal axis to elicct reciprocation of the carriage upon the trame, a link connecting said arm and the operating member, movement of the operating mcmbe about its axis serving to operate the link and arm to effect movement of the foot-rest to one of said positions, and means under the control of the arm for releasing the holding device when the foot-rest is in the last mentioned position.

ADAM JOSEPH MAY.

leo 

